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van de Heijningen, M. (author), van der Bent, G. (author), van der Houwen, E.H. (author), Chowdhary, A. (author), van Vliet, F.E. (author)Solid-state power amplifiers need protection against reflected power at the output caused by load mismatch. The standard method for protection is to include a ferrite-based isolator at the output. The isolator will redirect all reflected power to a dissipating load resistor and will ensure that the output of the amplifier always sees a 50 Ω load...conference paper 2014
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van Heijningen, M. (author), van der Bent, G. (author), van der Houwen, E.H. (author), Chowdhary, A. (author), van Vliet, F.E. (author)Solid-state power amplifiers need protection at the output to handle high reflections due to mismatch. Normally this is implemented by using a ferrite-based isolator. These are however large and bulky components. This paper presents a Gallium-Nitride power amplifier module with automatic protection against large reflections based on fold-back...conference paper 2013
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van Heijningen, M. (author), van der Bent, G. (author), van der Houwen, E.H. (author), Chowdhary, A. (author), van Vliet, F.E. (author)Solid-state power amplifiers need protection at the output to handle high reflections due to mismatch. Normally this is implemented by using a ferrite-based isolator. These are however large and bulky components. This paper presents a Gallium-Nitride power amplifier module with automatic protection against large reflections based on fold-back...conference paper 2013
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Alefs, B.G. (author), den Hollander, R.J.M. (author), Nennie, F.A. (author), van der Houwen, E.H. (author), Bruijn, M. (author), van der Mark, W. (author), Noordam, J.C. (author), TNO Defensie en Veiligheid (author)Millimetre-wave imaging is an emerging technique for detection and discrimination of objects based on their radiometric signature. Recent applications focus on near range detection of metallic objects, such as weapons concealed under clothes and far range detection of vehicles or people. For outdoor scenarios, the human body is particularly well...article 2010
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TNO Defensie en Veiligheid (author), Huizing, A.G. (author), Otten, M.P.G. (author), van Rossum, W.L. (author), van Dijk, R. (author), Maas, A.P.M. (author), van der Houwen, E.H. (author), Bolt, R.J. (author)This paper describes a concept for a scalable RF sensor payload for small UAVs that can perform multiple RF functions such as synthetic aperture radar (SAR), ground-moving target indication (GMTI) and ESM. Essential to the scalable multifunction RF payload concept is the digitization of the antenna signals on transmit and receive at the antenne...conference paper 2009
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TNO Defensie en Veiligheid (author), van Dijk, R. (author), van der Houwen, E.H. (author), Maas, A.P.M. (author)A phased-array FMCW radar has been design and built from COTS components. The generation of the frequency sweep is done by mixing a central local oscillator signal with a baseband sweep of a direct digital synthesizer (DDS). To ensure maximum flexibility the receive side has been equipped with it's own swept signal. The transmit frequency...conference paper 2008
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- Gerini, G. (author), Hulzinga, A. (author), Bekers, D.J. (author), van der Houwen, E.H. (author), Schippers, H. (author), Creemers, R.J.C. (author), Bron, E. (author), TNO Defensie en Veiligheid (author) conference paper 2007